2D Perovskite Nanosheets with Thermally-Stable High-κ Response: A New Platform for High-Temperature Capacitors

We investigated high-temperature dielectric responses of high-kappa perovskite nanosheet (Ca2Nb3O10), an important material platform for postgraphene technology and ultrascale electronic devices. Through in situ characterizations using conducting atomic force microscopy, we found a robust high-temperature property of Ca2Nb3O10 nanosheet even in a monolayer form (similar to 2 nm). Furthermore, layer-by-layer assembled nanocapacitors retained both size-free higher characteristic (similar to 200) and high insulation resistance (similar to 1 x 10(-7) A/cm(2)) at high temperatures up to 250 degrees C. The simultaneous improvement of er and thermal stability in high-kappa nanodielectrics is of critical technological importance, and perovskite nanosheet has great potential for a rational design and construction of high-temperature capacitors.